public function refund(array $args) {
        $orderId = (int)$args['orderId'];
        $ometa = new OrderMeta($orderId);

        $this->module->api->adminreq = true;
        $res = $this->module->api->refund($ometa->getTransactionId());
        if ($res instanceof GenericError) {
            return $res;
        }

        $ometa->setTransactionState(new TransactionState($ometa->getTransactionId(), TransactionState::REFUNDED));

        return $res;
    }